Using ethanol free gas.
I have a 2014 Ram 3500 w/ 6.4 Hemi. I have been using the pure gas which is 100% ethanol Free. While it more $$ I get around 4MPG in the city and about 6 MPG on the highway, your mileage may vary. ...
Forum Discussion
B.O. Plenty wrote:Turtle n Peeps wrote:Totally agree! How can eliminating the 10% alcohol give you an additional 6 mpg on the highway..I'm gonna have to throw the BS flag on that one.
E free gas will give you about 4 to 5% difference in mileage.
If anybody tells you appreciably more their math is wrong or their testing is flawed.
E gas will always give you more power because of the O2 and cooling effect it give your engine.
B.O.
Because that 10% ethanol accounts for about 3 points of octane and when the ethanol has absorbed 0.5% of water (to the entire E10 volume) the gasoline can no longer hold the ethanol in solution and the now 'pregnant' (water-laden) alcohol settles to the bottom of the tank.
You now have fuel tank of ~84 octane gas with some very water-laden alcohol laying on the bottom.
Do you really think going from 87 to 84 octane and with NO oxygenators in it is only going to give you a 4 or 5% loss in mileage?
Even big reputable sources like Road & Track magazine call 6 to 10% 'typical' and that's with fresh fuel and no other issues.
